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bug#17561: Emacs can forget processes
From: |
Jorgen Schaefer |
Subject: |
bug#17561: Emacs can forget processes |
Date: |
Wed, 28 May 2014 22:53:46 +0200 |
On Tue, 27 May 2014 17:47:41 -0700
Paul Eggert <eggert@cs.ucla.edu> wrote:
> I'm still suspicious of the interaction between pthread_sigmask and
> vfork, though. What happens if you do the following shell session,
> where "$" is the shell prompt and "(gdb)" is the GDB prompt?
Assuming you meant in an Emacs with vfork enabled (i.e. the default):
> $ grep -i pthread src/config.h
/* Define to 1 if you have pthread (-lpthread). */
#define HAVE_PTHREAD 1
/* Define to 1 if you have the <pthread.h> header file. */
#define HAVE_PTHREAD_H 1
/* Define to 1 if the pthread_sigmask function can be used (despite bugs). */
/* #undef HAVE_PTHREAD_SIGMASK */
/* Define to 1 if pthread_sigmask(), when it fails, returns -1 and sets errno.
/* #undef PTHREAD_SIGMASK_FAILS_WITH_ERRNO */
/* Define to 1 if pthread_sigmask() may returns 0 and have no effect. */
/* #undef PTHREAD_SIGMASK_INEFFECTIVE */
/* Define to 1 if pthread_sigmask() unblocks signals incorrectly. */
/* #undef PTHREAD_SIGMASK_UNBLOCK_BUG */
#define PTY_TTY_NAME_SPRINTF { char *ptyname = 0; sigset_t blocked; sigemptyset
(&blocked); sigaddset (&blocked, SIGCHLD); pthread_sigmask (SIG_BLOCK,
&blocked, 0); if (grantpt (fd) != -1 && unlockpt (fd) != -1) ptyname =
ptsname(fd); pthread_sigmask (SIG_UNBLOCK, &blocked, 0); if (!ptyname) {
emacs_close (fd); return -1; } snprintf (pty_name, PTY_NAME_SIZE, "%s",
ptyname); }
#ifndef _POSIX_PTHREAD_SEMANTICS
# define _POSIX_PTHREAD_SEMANTICS 1
> $ ldd src/bootstrap-emacs | grep -i pthread
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x00007f0c1cf79000)
> $ gdb src/bootstrap-emacs
> (gdb) disas rpl_pthread_sigmask
No symbol "rpl_pthread_sigmask" in current context.
> (gdb) disas pthread_sigmask
Dump of assembler code for function pthread_sigmask:
0x00000000005642c0 <+0>: sub $0x8,%rsp
0x00000000005642c4 <+4>: callq 0x405790 <sigprocmask@plt>
0x00000000005642c9 <+9>: xor %edx,%edx
0x00000000005642cb <+11>: test %eax,%eax
0x00000000005642cd <+13>: jns 0x5642d6 <pthread_sigmask+22>
0x00000000005642cf <+15>: callq 0x405a10 <__errno_location@plt>
0x00000000005642d4 <+20>: mov (%rax),%edx
0x00000000005642d6 <+22>: mov %edx,%eax
0x00000000005642d8 <+24>: add $0x8,%rsp
0x00000000005642dc <+28>: retq
End of assembler dump.
> (gdb) disas rpl_vfork
No symbol "rpl_vfork" in current context.
> (gdb) disas vfork
Dump of assembler code for function vfork@plt:
0x0000000000405ed0 <+0>: jmpq *0x39e662(%rip) # 0x7a4538
<vfork@got.plt>
0x0000000000405ed6 <+6>: pushq $0xfc
0x0000000000405edb <+11>: jmpq 0x404f00
End of assembler dump.
> (gdb) disas rpl_fork
No symbol "rpl_fork" in current context.
> (gdb) disas fork
Dump of assembler code for function fork@plt:
0x0000000000405cb0 <+0>: jmpq *0x39e772(%rip) # 0x7a4428
<fork@got.plt>
0x0000000000405cb6 <+6>: pushq $0xda
0x0000000000405cbb <+11>: jmpq 0x404f00
End of assembler dump.
Regards,
Jorgen
- bug#17561: Emacs can forget processes, (continued)
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/23
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/24
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/25
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/26
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/26
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/26
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/27
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/27
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/27
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/27
- bug#17561: Emacs can forget processes,
Jorgen Schaefer <=
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/28
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/28
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/28
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/29
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/29
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/29
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/29
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/29
- bug#17561: Emacs can forget processes, Andreas Schwab, 2014/05/29
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/29